Late. Still. Ughhhh

Is being 2 weeks late on my period and still showing negatives on my tests mean I’m not pregnant?

Is 2 weeks too early??

It’s REALLY hard to ask off of my job (I am a teacher and they don’t like us missing unless we actually are pregnant) so I don’t want to have to go get a blood test just yet if it will show up as a no on that too... 😥